Dental articulator.



l. NAKAHARA.

DENTAL ARTICULATOR. APPLICATION man IAN.15. x911 Patented July 16, 1918.

m: NORRrS PEYERS cm. FR 0.. WASHINGYON. D c.

4.5 Y the slots 16 and adjustableboth longitudinallyand vertically therein, are supporting IcHIGono NAKAHARA, on'roxYo; JAPAN.

I DENTAL ARTVICVULA'ZJOR.

- used to correct the irregular motion offthe jaws with natural teeth. Itwill be seen-that this device inprovids ing for a proper registeringmotion of the upper and. lower jaws, aconsequent proper registering. of the upperand lower molds,

which are primarily inserted into the mouth and fitted over the upper and lowerjawsof apatient, for the preparation of artificial teeth, will result. I a In the accompanying drawing: Figure lis a perspective view. Fig. 2 is a similar View with the device in applied position. v s.

In these views it will be seen that the reference" numeral 1 designates ase'gmental ring having its ends connected by means of a strap 2, which rendersthe ling v1 adjustable to the contour of. the head. of the patient. Provided on opposite sides of the ring are the outstanding'lugs 3 and 3 provided with hook members 4:, the hook portions of which extend below the lugs3'and 3'. Secured to theringl at 6 is a strap. 5, adapted to extend around and engage the underside of'the lower jaw of the patient,

and to engage the buckle 7 with its opposite end.

Secured to the ring 1 in a position; correspending to the location of the temples of the patient, are lugs Sand 8v provided with s1ots16. .Secured 'within the-innermost of Q members .9.

p fSecuredto the bandl in a p'ositiondirectly ably mounted on such-band 5 bymeans of -theconnection 1.1,is a rod 10 adapted to extend downwardly in front of thenose andv below the lower jaw of the patient;

' which the chin-of the patient is adapted to above the noseof'the patient, and adjusttransverse bar 13 carrying a jaw plate12, in

; Specification of Letters Patent. A ncationma January 15, 1917. Serial n 142,543.

Pat nted July 16, 1918.

1 seat, is providedwith endplates 18. formed with slots'19,through whichrods 17 and 17, adjustably secured within the outermost slots 16 of the plate 8 areadapted to pass. Secured to the bar 13 and extending di-' rectly outwardly therefrom, is a fork 13 adapted'to embrace the rod 10.- Secured to the lowermost portion of the rods 17 and 17 is a member 20. provided. with a fork 21 adaptedto' engage the lowermost portion of the rod 10; Springs-14c, 14, 15 and 15 are p'rovided,.-adaptedto be secured at one of their ends to, a portion of the bars 13, and having their opposite ends secured to the supports 9 and 4" respectively.

From the above it will be seen that to procure-the proper results it is. only necessary to. place the band 1 around the patients headxand"make the same conform to the contour of the head by means ofthe strap 2,-subs'equently depressing the plate 12and consequently thebar 13, to allow of the in sertion of the-patients jaw or chin into the member 12 passing the strap 5 around the underside ofthe lower jaw and securing the end thereof to the. buckle 7. It will be seen" that. it would be impossible for the patient to take otherfthan a correct bite, in view of the fact'that all sidewise'motion of the jaws "-would be prevented by means of the enag'ement of the forks 12 with the bar 10. @he immovable nature of the part 10'is due to its support by means of theconnection 11 and engagement at its lowermost end with the fork 24. It will-be. further noted that the slightest .sidewise. movement of the lower jaw is prevented by means of the rod" 17 passing through the slot 19. and that further, the patient is free to make the proper normal motion with his jaws, and that the spring's'lt, 14, 15 and 15 will always serve to keep the member 12 firmly in engagement with the chin of the patient. .Having now particularly described and ascertained the nature of my said invention and in what manner it is to be performed I declare that what I claim is 1. A device for preparing a model of a tooth-bite comprisin a'ring adapted to be fastened on a patients head, a guide rod on saidfring, a jaw 'presser, springs connecting 1 said jaw presser with said head-ring, and a guidejbar on said jaw presser cooperating with said guide rod for maintaining the patients j aws'sufliciently straight.

. 2. A device for preparing a model of a t00th-bite comprising a ring adapted to' be fastened on a patients head a guide rod on sald rlng, a jaw presselga guide 'bar'projecting from the front of said jaw presser and. coiiperating with said guide rodf'or ma'1n-" taining the patients jaws sufficiently straight, and spiral springs connecting said" j aW presser with said head;.:ring; V

3. A device for preparing a model of a tooth-bite comprising a ring adapted'tobe fastened 011 a'patients head ia guide rod on said ring, a transverse barya jaw Presser supported on. said bar, a guide bar project ingfromthe middle point ofthe-said transverse bar and coeperating with said guide rod-for maintaining the patientsjavvs sufficiently straight,. and spiral springs: connectstraight, vertical rods connected to said. head ring, a connecting rod connecting the lower endsv of said vertical rod, an additional guide bar on said: connecting rod cotip'erat- I ing with said guide rod, and springs connecting said jaw presser to said head ring;

' .5. A device forpreparing, a model of a tooth-bite comprising-a ringf adapted to be fastened on a patients head,-v a guide rod! on a said ring,a transverse bar, a guide bar on the front of saidtransversefbar cooperating 'With said guide rod for maintaining the 'p'atlents" Jaws su'fiiciently straight, a law press'erfixed on said transverse bar, PIOJGCting pieces fixed on said head ring, vertical rods fixed to said pieces, a connecting rod 'co'nnectingthe lower end of said vertical ..rod,- an additional guide bar on said connecting rod cooperating with said guide'rod, and

springs connecting; said transverse to Sf d-headr1ngV V p 6. A device for preparing a model of a tooth bite comprising. a ringadapted to. be

fastenedi on a patients head, a guide rod on said ring,-a transverse har a jtawxpi 'esser on said transverse bar, a guidebar fixed on said transverse bar at'thesmiddle of theftransverse bar, saidguide bar coiiperatingi with said guide rod" for maintaining the patiei'it s jaw-ssufliciently straight,-,projecting pieces fixed on saidz 'headi'ringzand provided with small slots, vertical rods fixed in said slots,

a connecting rod oonnect-ingthe lower ends,

of the said vertical rods, an additional guide liar ca-rrled bysal'd COIIIIGO'DIIIQ} rod and c0 operating With said guide FOCl SZLlCl vertical rodpassingjthroughsaidtransverse bar, and a spiral springs connecting said head ring and said transverse bar; V p .7

' lin testimony whereof I aliix my signature in presenceoftwowitnesses; V V

ICHIGORO NA'KArIfaR-a;

Witnesses: 5 a i F. HAWLEY, i HARUTADA YASAMURA.

Copies: 01% thin mm i bo' obtained forflve' cent: each-,by addressing the; commissioners: Yatentu. r r Wl :hington ,D;G.?" r a 

